CH101 Lec8

CH101 Lec8 - Some practice while you wait: Molecule CO2 SO2...

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Some practice while you wait: Molecule Polar? (y/n) What IM forces? SO F Cl I S I Cl F F I I S Cl Cl F
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Some practice while you wait: Molecule Polar? (y/n) What IM forces? SO O = C = O N dispersion S O O Y dispersion, dipole-dipole N dispersion Y dispersion, dipole-dipole F Cl I S I Cl F opposites  are equal! F I I S Cl Cl F opposites  are  not   equal!
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Section 8.1 Solids Solids have large  inter molecular forces (between  the molecules) thus, motion is restricted. Crystalline solids  - we ll de fine d re pe a ting   pa tte rns  (lo ng  ra ng e  o rde r) Amorphous solids  - o rde r o ve r o nly ve ry s ho rt  dis ta nc e s  (lo c a l o rde r)
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Solids- Unit Cells Unit Cell -  smallest  repeating unit of the crystalline lattice Mus t re pe a t to  fill  ALL  s pa c e !
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(a = b = c) ( α = ß = γ = 90 o ) (a = b = c)( α = ß = γ 90 o ) (a b c) ≠≠ ( α = ß = 90 o γ ) There are seven different types of unit cells
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Parameters used to define unit cells a b c γ α β We will focus on the simplest type of unit cell, the cubic unit cell where; a=b=c and α=β=γ
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We will focus on metallic solids because they  contain   only 1 kind of atom . Simple Cubic (sc) 1 atom on  each corner Body Centered Cubic (bcc) Face Centered Cubic (fcc) 1 atom on  each corner  + 1 on each  face 1 atom on  each corner  + 1 in center Section 8.2 These pictures are in your book on page 167!
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Solids- in 3-Dimensions Simple Cubic (sc) 1 atom on each corner Section 8.3
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Body Centered Cubic (bcc) 1 atom on each corner + 1 in center 1 / 8 (8 corners) + 1(center) =  2 atoms/cell Solids- in 3-Dimensions Section 8.3
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Body Centered Cubic (bcc) 1 atom on each corner + 1 in center Solids- in 3-Dimensions Section 8.3 center corner corner center TOP VIEW
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Face Centered Cubic (fcc) 1 atom on each corner + 1 on each face Solids- in 3-Dimensions Section 8.3
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(sc) Body Centered Cubic (bcc) Face Centered Cubic (fcc) Section 8.4 Coordination Number Coordination Number (CN)-  the number of atoms  that surround an atom in a crystal lattice. CN = 6
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This note was uploaded on 03/29/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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CH101 Lec8 - Some practice while you wait: Molecule CO2 SO2...

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